ntụ ntụ bentonite bụ mineral na-abụghị nke nwere montmorillonite dị ka ihe mejupụtara mineral. Ọdịdị nke montmorillonite bụ ụdị kristal 2: 1 nke nwere silicon-oxygen tetrahedrons na akwa aluminom-oxygen octahedrons. Enwere ụfọdụ cations na nhazi akwa, dị ka Cu, Mg, Na, K, wdg, na mmekọrịta nke cations ndị a na sel nke montmorillonite adịghị akwụsi ike, ọ dịkwa mfe ka cations ndị ọzọ gbanwere ya, yabụ nwere ezigbo mgbanwe ion. Etinyela mba ofesi n'ihe karịrị ngalaba 100 na mpaghara 24 nke mmepụta ụlọ ọrụ mmepụta ihe na ọrụ ugbo, na enwere ihe karịrị ngwaahịa 300, yabụ ndị mmadụ na -akpọ ya "ala ụwa niile."